Looking for Apoptosis/Necrosis Assay

Hello,
I'm working with an adherent cell line (keratinocytes). For screening
toxicological effects I'm looking for a good assay to measure the
percentage of apoptotic and necrotic cells after exposure.
Sincerely,
Kai Kehe
Institute of Pharmacology and Toxicology, Garching, Germany
e-Mail: kai.kehe at fbw.baynet.de